On Turbulent Pressure Confinement of Ultracompact H II Regions

Details On Turbulent Pressure Confinement of Ultracompact H II Regions On Turbulent Pressure Confinement of Ultracompact H II Regions

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...473l.131x&link_type=abstract

Astrophysical Journal Letters v.473, p.L131

Astronomy and Astrophysics

Astronomy

40

Ism: H Ii Regions, Ism: Kinematics And Dynamics, Stars: Formation, Turbulence

Scientific paper

It has been proposed recently that the small size and long lifetime of ultracompact (UC) H II regions could be due to pressure confinement if the thermal pressure of the ambient gas is higher than previous estimates. We point out that confinement by thermal pressure alone implies emission measures in excess of observed values. We show that turbulent pressure, inferred from observed nonthermal velocities, is sufficient to confine UC H II regions and explain their longevity. We predict an anticorrelation between the size of UC H II regions and the velocity dispersion of the ambient neutral gas and show that it is consistent with existing observations.

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